Dealer listings

I have noticed that many listings omit some dealers and still list some that No longer exist
Why is this?
Doesn't anyone ever check??
Pat Vetter,Mercury Dime registry set,1938 Proof set registry,Pat & BJ Coins:724-325-7211
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I have noticed that many listings omit some dealers and still list some that No longer exist
Why is this?
Doesn't anyone ever check??